There are of course some of the top 10 coins, which would qualify in my view:
- Fiat Currency: Which is like cashing out of the crypto world, not really an alternative to BTC
- The majority chain: the split of BTC that would have the most nodes, miners, merchants and users behind it
- ETH: Which has the closest market cap to BTC, and the most users after BTC
- Ripple: Which has banking integration and a somewhat stable price
- LTC: Which is the closest to BTC in terms of code similarity
- Monero: Which is has privacy implemented in it
- Dash: Which is has low fees, privacy and a democratic consensus mechanism
So which one is it for you?
By the same name ("disaster") you put together events some of which can hardly be called that. For example, if Bitcoin gets forked, it may actually turn out beneficial in the long run. Wasn't Litecoin essentially a Bitcoin fork back then? On the other hand, it will all depend upon how much other coins may be affected. If they all should get affected, you'd better cash out into fiat, of course...
And short Bitcoin to earn some money along the way
The other funny thing is that well in my own opinion those certain alt coin except for fiat that has been stated will be having the disaster and die first before it goes to bitcoin's disaster lol